HD16 6-in-1 Safety Detector — Order

The HD16 shows a real-time CO reading in PPM (parts per million). Above 50 PPM it starts a repeating reminder beep; above 200 PPM the alarm sounds continuously. Those are this device’s own alert thresholds — not a safety scale. No CO reading should be treated as “safe”: if the alarm sounds, move to fresh air and call emergency services. What the display gives you is awareness — the live number, at a glance, no app and no subscription.

Most budget detectors do one thing: beep once CO reaches an alarm threshold. The HD16 puts six functions on one unit — CO monitoring, combustible gas and smoke alerts, temperature and humidity readings, plus a built-in rechargeable battery — with a live display so you can see what the air is doing between alarms.

Install one outside each sleeping area (hallway is the most common spot) and one on every floor of your home. For kitchens, mount it just outside the cooking area — not directly over the stove — to avoid nuisance alarms while still catching a real leak.

Placed correctly (outside the kitchen, not over the cooktop), the HD16 distinguishes between real CO events and temporary cooking steam/humidity. Its algorithm requires sustained dangerous levels — a 30-second boil won't set it off.

The HD16 has a built-in rechargeable battery, so it keeps monitoring through a power cut — roughly 8 hours of backup under normal use, which varies with how often the alarm sounds. On battery power the screen turns off after about a minute of inactivity to conserve power; the device is still monitoring, and the display wakes as soon as you touch it or a reading changes.

Tested to UL 2034 / UL 1484 / UL 217 standards. CE & FCC certified. RoHS compliant. Every unit is individually inspected and tested before it ships. We back every unit with a 2-year warranty, a 5-year sensor life, and 30-day no-questions-asked returns.